Crimping tool for dynamite cartridges



March 25, 1941. qc KA L, 2236140 I camrme TOOL Fox mrimurm CARTRIDGESFiled Jan. sj 'lsse FIG-4 FIG.'5 FIGS 7 INVENTOR CHgliLES S. KALEELATTORNEY Patented Mar. 25, 1941 UNI ED 2,236,1-fiii CRIMPING 'roor. FORmm r i z CARTRIDGES Charles s. Kaleel, Wilmington, Del., assignor aHercules Powder Company, Wilmington, Del, a corporation of DelawareApplication January 5, 1939, Serial No. 249,403

2 Claims.

This invention relates to a crimping device for closing the ends of apaper cartridge and more particularly to an improved crimping tool foruse in closing the ends of paper dynamite cartridges.

At present dynamite cartridges are manufactured by forming a hollowpaper cylinder of the desired diameter and length and closing one end byfolding a portion of the cylinders side wall across the end. To completethe cartridge, after charging it with dynamite, the remaining open endis also closed by folding a portion of the cylinders side wall acrossthe end. This method gives fairly satisfactory resultsin regard totightness of the end closure, ease of waterproofing the cartridge, andrigidity of the finished article if the cartridge diameter is small, forexample, under two inches, However, the dynamite cartridges having adiameter greater than two inches do not lend themselves readily toeflicient closing by 0 the folding method. This difliculty ofefficiently closing the end of large diameter cartridges is due to thegreater amount of paper folded across the ends of the cartridge. Thefolds of paper produce a bulky closure that is not rigid or tight andtherefore presents a cartridge that is very hard to waterproof.

It is the object of this invention to provide a means of closing theends of dynamite cartridges in a manner that will produce a cartridge ofimproved water resistance. A further object of this invention is toprovide a tool that will close the ends of dynamite cartridges in amanner that will give a rigid construction to the cartridge. A stillfurther object of this invention is to provide a means of forming aspiral bead joint between a paper'cylinder dynamite cartridge and apaper cup end insert. Further objects will appear hereinafter.

Now in accordance with this invention, I have found that by the use ofan especially designed and novel crimping tool I may curl two layers ofpaper together in a manner that forms a very tight spiral bead joint.Therefore, in accordance with this invention I have produced a dynamitecartridge by inserting a shallow paper cup within the end of a cylinderof paper and forming a bead joint between the two by the use of myimproved crimping tool. The bead joint so formed provides the cartridgewith a rigid end that is easily waterproofed. Further, the entireformation of the bead joint between the paper cup and the paper cylinderis performed by the crimping tool of this invention, quickly and in onesimple and eflicient operation.

the crimping tool.

Figure 6 shows a dynamite cartridge consisting of a paper cylinder intowhich is positioned a shallow paper cup preparatory to crimping.

Figure 7 shows the dynamite cartridge of Figure 6 after the papercylinder and paper cup have been crimped together in accordance withthis invention.

Figure 8 is an enlarged perspective view of that section of the diemember, Figure 4, below line BB.

A complete description of the construction and operation of my crimpingtool may be understood by referring to Figures 1 and 2 of the drawing inwhich:

The screw thread I provides a means of attaching the tool into anadapter that may be fitted into a horizontal or vertical revolvingmedium. The tool shown in the drawing contains an annular groove 2 thatserves to lighten the tool and causes a more even distribution of thestress between the adapter and the tool. The hole 3 is provided toreceive a pin that may be used to tighten or loosen the tool on theadapter. The tool may be keyed in any suitable manner to the adapter toallow revolving in either direction. It is to be understood that othersuitable methods are contemplated for attaching the tool to the adaptersuch as for example bolting or keying.

The size of the crimping tool is dependent on the size of the dynamitecartridge to be crimped. The relation between tool and the cartridgelies in dimension 4 which dimension approximately equals the outsidediameter of the dynamite cartridge that is to be crimped.

The crimping tool contains a bead-forming concavity 5 cut concentricallywith thread I in a manner that leaves a small hook 6, this hook 6 actsas a guide in the formation of the crimp bead. The bead-formingconcavity 5, further, contains a plurality of specially cut slots 1 intowhich are fitted die members 8 that are radially movable. Theconstruction of these die members 8 is shown in detail in Figures 3, 4,and 5 and includes an elongated hole 9 that allows radial adbead-formingconcavity in shape but is further rounded at the edges as is indicatedby the line I2, and by Figure 8 which is a perspective view of the die8. This method of rounding the edges of the concavity H prevents thecartridge on which the die members torn. It will be noted have theconcavity I l struction feature allows the crimping toolto be revolvedin either direction with equally good results. a v The successfuloperation of the crimping'tool of this invention depends upon the diemembers 8 and their radial adjustment- These die members 8 are soadjusted outwardfrom .the' beadforming concavity 5 that they exert ari,uninterrupted drag on the paper dynamite cartridge and this drag causesthe formation of a spiral bead joint between the paper cylinderandithepaper cup insert. The actionof the crimping tool in forming the spiralbead jointfis diagrammatically shown in Figures 6 and 'I and said tooloperates as follows: i

The paper cup I3 is inserted in the paper cylinder l4 and held in such aposition thatjthe distance i5 is approximately equal to the depth of thecup l3; the crimping tool while revolving is brought into contact withpaper cylinder l4 containing the paper cup insert i3 and the action ofthe dies 8 and the bead-formin'g conform an interlocking spiral beadiliinsert 13 and the paper cavity 5 between the paper cup cylinder l4.rigid joint that may be easily waterproofed;

A specific example of the operation of a crimping tool in accordancewith my invention may be made with reference to the closing of the endof a dynamite cartridge 4" in diameter,

but it will be understood that this'is but one exemplification of myinvention and that cartridges of various diameters, for example, fromabout 2" to about 7 /2, may be effectively closed by similar crimpingtools prepared .in accordance with this invention.

Now'to prepare a 4" outside diameter dyna- I v crimpinghead: is? thei-'possibility .c' of producing mite cartridge a paper cup insert aboutdeep is positioned, by the use of a mandrel,fwithin a 4" diameter papercylinder so that the amount of the paper cylinder extending'aboveth'eedge of the paper cup is about'%" or approximately equal to the depthofthe cup. "The crimping tool and cartridge are brought together 'by'suitable means, for example, or cartridge or by moving cartridge. Whenthe crimping'tool 1000 R. P. M. but preferably within therange is alsoclosed, by the crimping head oft this invention, in the mannerdescribed-above with the exception that the explosive itself acts as a8- are acting from being k that the die members} rounded on both edges,in dicated by line 12 and by Figure 8, which-.con-

v =lappedz-jointfl-Thisoverlapped bead does not "having fidiarneter'sThis spiral bead I6 is a tight and v H "about 0.06"

by moving the tool both the 'too1- and' is brought into contact with thecartridge it. may be 'revolving within the range of'about 100 toabout'vention.-- of about 550 to about 650 R. P. M. The"action of the diemembers turns-the paper cylinder over.-

Afteri'illing the car- 7 t t 1 I mandrel to hold the paper cup insert inposition. It will be understood that the cartridge or parts thereof maybe treated in any desirable manner such as, for example, labeling,printing, or waterproofing, at any time during or after the crimpingoperation.

The die members controlthefprmation of the spiral beadand will by proper'rafdial adjustment produce a small tight bead or a'l'arge loose bead.vIt is to be noted that if the die members are positioned so that theycoincide exactly with the bead-forming concavity of the crimping tool;the resulting bead formed will not consist,

of; aspiral but vvil-l .consist of a simple overpresent the rigidityobtained by a spiral bead and furtheris much more diiiicult toeffectively and prefer toadjustthe dies outward from the beadformingcon'ca about fan inch, as

7 this distanceturns bead ri er-l ly tight "to make a rigidc y editablea'ppearance tha "l atei'proof.

inches respectively "mp ngc too :of

'I 8 sucee ni1 y-erimp dynamitebs'eartridges' made of paper bet'wethickness.

the l diameter 0mm bead-forming concavity; :and the adjustment ofthediemembers forming concavity and adjustment;ofqthegdie members for variousthi'cknessyriof-r-spape ay 1 best -be determinedexperimentally.5; v 1-An' advantage: resulting. from: thisginve ntion v and dueto the' splralbeadaiformedgbyr he hee forming I concavity. and dieaqmembers of thedynamite cartridges-that have ."aem'uch superior of the cartridges andsubsequent spilling, -i the I dynamite from the cartridge asconditionthat is orten' e eoumered while handling'zand remi porting cartridgeshaving' ends closed; by

'foldingL A still further advantageigis thee-imfprov'ed" appearancebfthei calftrid'ges.

It .will be. understoodsthat the taiisiandiex arnple's giv e'nhereinbefore' ar'e'zillustrative; ,only and in no way llmiting dnmyinventionjafsbroadly described- :hereinbefore and irivthe appended What-Iclairn and desiiie t '1'. In 'ardevicefiorspirally-inter 5th of acylindrical paper icartridge adapted,to; contain an explosive with theflange of a paper cup end-insert, the combination of a revoluble aboutZ005i'f sand i I If the aper? to zbe' "used is cut-side the abov'erange'wof -thickness. I may obtain suc'eessful crimpingnwby varying vz'rne;.a u l. optimum 'c'onditioii's ofr 'diameter ,ofathe ebeflcrimping tool which has an annular concavity shaped to provide adownwardly and outwardly extending hook-like portion for vreceiving androlling the said wall inwardly and over the flange of the saidend-insert, whereby said wall and flange are rolled into a spiral and aplurality of turning dies eachhaving a concavity conforming in shape tothe annular concavity of said crimping tool positioned circumierentiallyabout said annular concavity.

2. In a device for spirally interlocking the wall of a cylindrical papercartridge adapted to contain an explosive with the flange of a paper cupend-insert, the combination of a revoluble CHARLES S. KALEEL.

